701660 3.7V 650mAh Lithium Polymer Battery

A 3.7V 650mAh lithium polymer battery adopts a single-cell pouch structure and maintains a nominal voltage of 3.7V with a full-charge limit of 4.2V. Meanwhile, the cell capacity is controlled at 650mAh through strict electrolyte dosing and electrode matching, which stabilizes energy storage behavior across production batches. In addition, designers regulate internal impedance to keep voltage response consistent under varying load conditions.

Materials Composition and Cell Architecture

Manufacturers construct the battery using layered lithium cobalt oxide or nickel-based cathode coatings combined with graphite anodes. Furthermore, aluminum-plastic composite film forms the external pouch, which seals internal chemistry while maintaining flexibility. Copper and aluminum foils act as current collectors, and they are precisely coated to enhance electron flow efficiency. Meanwhile, microporous separators are inserted between electrodes to reduce internal short-circuit risks and maintain ionic stability during operation.

Assembly and Welding Process

During fabrication, cells are first selected and grouped according to voltage tolerance and impedance matching. Subsequently, automated spot welding machines connect nickel tabs to establish stable electrical pathways, while minimizing thermal stress on the cell body. After that, technicians integrate a protection circuit module (PCM) to control overcharge, over-discharge, and over-current behavior. Additionally, insulated leads and connectors are fixed to ensure stable external electrical connection without loosening under vibration.

Packaging and Structural Finishing

Once the internal assembly is completed, the pouch cell is sealed using heat-lamination technology to prevent electrolyte leakage and moisture ingress. Moreover, outer insulation layers are applied to enhance mechanical strength and improve dimensional stability. At the same time, engineers verify sealing integrity through pressure and insulation tests before the final encapsulation stage.

Standards and Electrical Regulation

Production generally follows lithium-ion safety frameworks such as UN38.3 transport testing, CE conformity, and RoHS material restriction requirements. Furthermore, charging control is implemented through constant-current/constant-voltage (CC/CV) algorithms, limiting maximum cell voltage to 4.2V. In addition, cycle reliability is evaluated through repeated charge-discharge testing under controlled temperature conditions to ensure stable electrochemical performance throughout manufacturing validation stages.

Product Features

1. 🛠️ Customizable
   Customizable to meet customer requirements
2. ⚡ High Power
   Max. 20C discharge rate available
3. ⏱️ Long Cycle Life
   Meets long-term product usage needs
4. 🛡️ High Safety
   Passed comprehensive safety tests
5. 🔋 True Rated Capacity
   Matches the product design capacity
6. ⚛️ Multi-Chemistry Options
   Covers LCO, NCM, NCA and LFP systems
7. 🧰 Multi-Protection Mechanism
   Built-in protection board with overcharge, overdischarge, overcurrent and short-circuit protection

Product Application Areas

This product is suitable for a variety of portable and powered electronic devices, with typical applications including:

• Personal Care & Health: Electric Toothbrushes, Beauty Devices, Fitness Trackers, Medical Devices

• Smart Digital & Audio: Headphones, Speakers, Nebulizers, Toys, Lights

• Financial Payment & Office: POS Machines, USB Tokens, Portable Printers